The cooling water chemistry has changed
steadily over the past decade. Use of high performance antiscalants, corrosion
inhibitors, polymer for better dispersion, total prevention of microbial
deposits by using powerful biocides and biodispersants, pH boosters and
advanced hardness stabilizers is the current practice. But addition of so many
different chemicals to the cooling water system (CWS) makes the cooling water
chemistry so complex and complicated that it is very difficult to control it by
the operator. A clear understanding about the contribution of antiscalant and
zinc ions separately towards the corrosion control in a CWS is required. In the
present work, a single antiscalant (trisodium phosphate) was tried which may
control scaling as well as corrosion problem in CWS. Weight loss and
electrochemical polarization technique have been carried out at different
temperatures using various concentration of the inhibitor. Mechanism of
inhibition is explained on the basis of molecular structure of the inhibitor. The
inhibitor provides good inhibition efficiency and acts as anodic inhibitor when
present alone and mixed inhibitor with zinc ions. Moreover, addition of zinc
ions to cooling water along with inhibitor, do not increase inhibition efficiency
of inhibitor to an appreciable extent.

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